* cough SPOILERS cough *
^_^ I LOVE LocoRoco, and after having to restart this level a couple of times (THANKS A LOT, math class), I decided to use the select button to show all the hidden areas in this one level.
SO: Hidden areas in LocoRoco, World 2, Level 7!
Shown in order of you finding them. Woot.
World 2 Level 7
(if you get everything NOT hidden plus this, you get perfect all.)

This is the first one, and the easiest. Just head to the left after starting. Whoot.

This one is tougher because the ground is violently rolling the entire time you are trying to jump on... M$#(* freaking ground.

After you get to the end of the vibrating landscape, hop up above the exit for a bit of stairway fun.

The funnel of DOOM! This one is pretty obvious I thought. Just jump.

This is a cleaver one, this secret area is INSIDE the funnel of doom secret area! Neat huh?

Secret flower. Not really though... Just TRY to avoid this one.

After that last one, make sure to jump to the right of the funnel before you head down for an easy hidden area!

This is to the left after the funnel.

This is INSIDE the above secret passage... I added it because three of the four flowers shown are hidden initially.

This one gave me the most heartache... Use the guy with the nose to shoot yourself onto that grassy knoll on the left, and jump to here. HOWEVER, if you miss by even a little, you will hit a spike and have to start all over... ^_^;;;
World 3 Level 1
Sorry for going to links, I am not allowed more than 15 images... ^_^;;;
http://i72.photobucket.com/albums/i1...L1W3/PIC10.png
Yeah, on the first trampoline try jumping to the right.
http://i72.photobucket.com/albums/i1...L1W3/PIC11.png
If you miss this one, but you do not go down the funnel, it IS possible to get it. Just VERY very hard.
http://i72.photobucket.com/albums/i1...L1W3/PIC12.png
Underneath the giant stick/musical instrument... O.o ze bat cave.
http://i72.photobucket.com/albums/i1...L1W3/PIC13.png
Being stuck as a stick has an advantage! If you hold still for a bit, you will stand up, making aiming easier.
http://i72.photobucket.com/albums/i1...L1W3/PIC14.png
Try to push left on the water spout that turns you back into a ball.
http://i72.photobucket.com/albums/i1...L1W3/PIC15.png
On that SAME wall, but higher up, try jumping.
http://i72.photobucket.com/albums/i1...L1W3/PIC16.png
>.> ze secret flower of doom. Woot.
http://i72.photobucket.com/albums/i1...L1W3/PIC17.png
Directly to the right of the flower of doom, room with a switch to turn on the water pressure.
http://i72.photobucket.com/albums/i1...L1W3/PIC18.png
^_^ Bounce on the head! Woot!
http://i72.photobucket.com/albums/i1...L1W3/PIC19.png
Under the stair case! Always check under stair cases.
http://i72.photobucket.com/albums/i1...L1W3/PIC20.png
At the bottom of the musical stair case, use that pointless floating step to get into this hidden area.
http://i72.photobucket.com/albums/i1...L1W3/PIC21.png
The last flower! WOOO! It is down the funnel, on the left, just before the sun.
http://i72.photobucket.com/albums/i1...L1W3/PIC22.png
Dancing with the sun! All 20 found.
World 3 Level 2
o.o sigh. Wish I could use my pics, but I am sure no one wants em anywho.
http://i72.photobucket.com/albums/i1...L2W3/PIC14.png
On the first jump, this is on the left.
http://i72.photobucket.com/albums/i1...L2W3/PIC15.png
Look below! This one is easy to do, easy to miss too.
http://i72.photobucket.com/albums/i1...L2W3/PIC16.png
Don't forget to stick all the way to the end on the roof sticky.
http://i72.photobucket.com/albums/i1...L2W3/PIC17.png
THIS one is tough... When you see the rotating flower, jump on the floating base. This hidden area is COMPLICATED, so don't skip it...
http://i72.photobucket.com/albums/i1...L2W3/PIC18.png
When you see this place inside the above hidden area, get this hidden flower.
http://i72.photobucket.com/albums/i1...L2W3/PIC19.png
STILL in the above hidden area, here is the HIDDEN exit for the hidden area.
http://i72.photobucket.com/albums/i1...L2W3/PIC20.png
This was tough to photograph... ^_^;;; had to do it twice. This occurs on the first river.
http://i72.photobucket.com/albums/i1...L2W3/PIC21.png
After the water ride, check out the bottom left of the falls...
http://i72.photobucket.com/albums/i1...L2W3/PIC22.png
A hidden area! Whoo! It is a flat spot among the fluffy.
http://i72.photobucket.com/albums/i1...L2W3/PIC24.png
This big room has several areas, so starting from the bottom and going clockwise... This flower is below the bottom platform.
http://i72.photobucket.com/albums/i1...L2W3/PIC23.png
This area is as far down and right as you can go in this room.
http://i72.photobucket.com/albums/i1...L2W3/PIC25.png
To reach this area, ride the carousel till you see the mushroom.
http://i72.photobucket.com/albums/i1...L2W3/PIC26.png
The FINAL flower! RIGHT at the end! (you can see the exit to the left in this picture...
Yeah, this is a small tutorial. BUT if anyone else wants to help others out with tough levels, maybe we can finally put those yellow blobs in their place! WHoot!