You can use real white chocolate that you have to temper then color with candy colors. Candy melts are much easier! If you use real chocolate, you'll have to temper it because it will get a white "bloom" once it dries if you don't.
The stuff you see in the grocery store the says for almond bark is the same stuff BUT I notice one of the brands lately is nasty couldn't tell you which one but I think the brand at Walmart is still fine.