coloring effects..help?

does anyone know how i can achieve effects like ANY icons? i really like all..






i also want to know how i would get the round corner on the small image?





sorry i know that alot that i ask for..but even if i just learned the effect on one i would be happy.
& this is not ICON related..but i've seen alot of ppl using a font thats sorta..dotted? anybody know the name of it? hehe thanks i LOVE you guys so much<3

ps. sry if my english isnt good!