for my IPad- We doodle!! omg so much fun. Angry birds (theres a lot they all are good!) cut the rope. talking tom cat 2, not really a game just for fun. fruit ninja, harbor master. monkey ball. first touch soccer.
IPhone- Tiny wings, scoops, sky burger, falling fred, doodle jump.
IPod touch- i mostly use it for music but.. jelly car 1,2 & 3 i like 3 the best.
favorite apps for making stuff when im bored and for younger siblings- cookiedoodle, cakedoodle, candledoodle, jellydoodle, cupcakes! XL(i think for IPad but there is another version for ipod/phone, More toast!, morecookies! tiedyedoodle, shave me! Sam's Remote.
apps for coloring photoshopping and doodling- photogene, drawing pad, color splash, sketchbookX, Animotion, photofunia!
for long car rides i just play Skee HD (skeeball) and Mad libs.
i guess this would go under drawing- spawnHD, Artisan, spawn lite.
for app to make smilies on your keyboard for ipone texting- Emoji. follow the steps it gives and you have it
sorry for the long list, ill stop now. If you want more suggestions of a specific kind of game post or private message me