There are some games that really pop out and grab your eyes' attention, and that's thanks to the vivid colors that are used in the game.

What are some of the most colorful games you've ever seen?

It's probably the most obvious pick, but for me, Splatoon grabs me with all the wicked colors.

yohis island (snes) im playing currently and its very colorful.

the trailer for the new R&C game.... alots of vibrant colours in that (smart use of colours too).
Id swear it was a nintendo game,... except its R&C and the graphics dont look like something the Wii U is capable of.

De Blob
Super Mario Sunshine

Mirrors Edge is mostly clean white but still has a lot of bright 'day-glo' colours.

Hm, a tricky question..

The Wind Waker?

1. Yoshi's island
2. Yoshi's story
3. The legend of zelda: the wind waker HD

Sunset Overdrive, Splatoon, The Wind Waker, Super Mario 3D World, No Man's Sky, Wonderful 101, Jet Set Radio and SMTxFE come to mind.

Some pics: 

The games I would've mentioned have already been said. So for me: Pokemon series, Dragon Quest VIII, Pikmin, Growlanser: WoT, Ni No Kuni

De Blod, Splaoon, Mario Galaxy, etc. The new Yoshi game is also looking pretty colorful.