I bought these little $5 cat mugs a few months ago with the intention of drinking hot chocolate out of them over the winter months. However, I didn't find the shape quite comfortable enough for sipping so then I decided to turn them into little succulent pots and they turned out super cute!
mug (the exact mugs I have are sold out but there are similar ones at World Market)
mini succulent plants
indoor potting soil mixed with sand
Fill the bottom third with small stones. Then sprinkle in soil to about 1 inch below the top of the mug.