re the etching . . . Colleen Kidder did one and it's beautiful! I have etching cream somewhere around here and plan to attempt her technique soon!
mom2kjs, As for coloring on glass, a lot depends on the effect you want! If you want a stained glass effect, there are many stained glass "paints" at Michael's and probalby even WalMart. If you want an opaque effect, there are acrylic paints, as long as the item will not be handled constantly.
There are also Pebeo Porcelain Paints and they and Delta also make paints designed for porcelain.
Can't help you much beyond that until you explain specifically what it is you're trying to do and the desired effect . . .