I have used a lot of the 2-color acrylic from several sales locations. They all use the same brands, pretty much. Rowmark brand is my favorite, mostly because they make MANY color selections.
The Rose/Blk and Gold/Blk are ideal for things like plaques.
If it is stand alone (like earrings) then the 0.060 thickness works well.
If it is being mounted to a firm surface, then the 0.020 works fine (too flexible to be without support though) .
NOTE: Do not get dismayed by the Full Sheet costs. Drill down a little for the normal 12x24 sheet prices and just cut the extra off to fit in the Glowforge.
If you do try the 2-color acrylics, here are some ballpark numbers to get you started in the link below.