A really fun and easy project. There are a ton of tutorials, but maybe you haven't seen one yet!
Use a Document program like Microsoft Word. Choose a font you would prefer. I printed the sizes on plain paper to choose the right font and size for my glass marbles.
Print Numbers or Letters out on cardstock/scrapbook paper.
Using Modpodge, "paint" the bottom of the glass marble with the glue. Place the marble over the number/letter. Press firmly.
Hint: I set aside the larger marbles for the higher numbers (i.e 20-30) and the smaller for the single digit numbers.
Layout to dry. I cut them in strips to make it more manageable. I was making five different colors for the different months.
Note: I did notice that sometimes the numbers would bleed because the numbers were made with an inkjet printer. I liked the look so it didn't bother me.
Need to glue!!
See post HERE!
And here are mine......in action!!