Here is a pattern for glass painting by Chris Gleaton called "Butterfly." The pattern allows you to decorate a 14 inch diameter glass circle. This listing is just for the pattern - not for the other supplies needed. Just in case you'd like to know in advance (so you can order your supplies all at the same time), here's the list:
14 inch diameter embroidery hoop
14 inch diameter glass circle
Hobby knife
Bubble level (optional)
Gallery Glass Simulated Liquid Leading in color 15152 Silver (1 tube)
Gallery Glass Paint - 1 tube of each of these colors, unless indicated:
15103 Cameo Ivory
15108 Kelly Green (2 bottles)
15109 Emerald Green (2 bottles)
15114 Sapphire Blue
15119 Raspberry
15121 Magenta Royale
15122 Petal Pink
15124 Black Onyx
You can make the design bigger or smaller by having a local printer shrink or enlarge the pattern. If you can find a round photo frame with glass, you could use that instead of the embroidery hoop thing. Many craft stores sell glass circles in this size, and I know my local Lowes will cut glass circles in any size you want.
I bought this pattern secondhand, and the pattern is unused and includes directions.
Please send me any questions you may have, and thanks for looking.