Color options are pearl (which looks like silver but is less visible...not my favorite), red, green, gold, silver, or copper. The default set is two each of red, green, and pearl, and three each of the cream and brown envelopes. You can request different combinations (though it looks like I'm down to 5 brown envelopes for now...must reorder those) of colors and envelopes in the buyer's notes box.
You can see the pearly a little bit better here. My camera isn't capturing it very well at all though. More cards to come! I ordered my Christmas stuff yesterday, so keep an eye out for those as well!