Wilton Sugar Pearls in:
Light Green                  Light Blue                    Light Pink                            Light Yellow
CK  4 mm  Pearls  in:
Orange 
Ivory 
Black 
Lavender 
White 
Blush
Red

Sixlets are another great Cake Decorating Item which is also a candy.
They are 10mm in diameter and have chocolate on the inside.
For larger, round decorations on a cake, I have the Gumballs which are 15 mm in size (about 9/16"). 
I currently have the following colors and will be adding new colors in the future as request are made.
Red
Royal Blue
Black
Orange 
Pearl Light Green
Pearl Pink
Pearl Blue
Pearl White
Pearl Yellow 
Pearl Lavender
Gold Gumballs
Silver Gumballs 
Shimmering Pearl
Yellow Gumballs
Shimmering Pearl
White Gumballs
Orange Sherbet flavored                        Blue Raspberry flavored                Bubble Gum flavored                    Green Apple flavored