Little known fact: You can take a swim noodle ($1.00 at Target) and slice it into 2 inch sections and you'd get close to 30 pieces. With a bit of elbow grease, you can affix a small screen to the bottom of each section. Fill this with your favorite grind and slap a piece of perforated duct tape and cover the top.
Put it in your Keurig and hit "brew".
You'll likely break the machine, but what a fun afternoon you've had.