Make interesting photo filters using Sharpie markers and the lid on top of a can of Pringles. This is an extremely easy, 30-second DIY project.
Then, use a Sharpie to draw any design that you want on the lid. The filter works best if you have lots of colors.
Voila! You have new filters. Please note that the Sharpie ink may smudge after it is applied on the top of the lid. It does not dry completely.
The pringles lid is too big to fit securely in front of my cameras, but it stayed when I propped it on the top edge of my Canon Rebel T3i. I also just held it in one hand sometimes when I took a few pictures.
Be especially careful that you do not accidentally smudge your camera lens. Also, please be careful that you do not scratch your lens. Make sure the smoothest side of the lid is facing toward it.