What is the best way to create tactile bumps on your keyboard?

There are 2 cheap sticker solutions that I know of.

• "Keyboard Bumps"
• "LocDots"

Disclaimer: I'm associated with "Keyboard bumps".

Small piece of regular office tape, or vinyl tape (they have different thickness) - works for me.

I've attached a tiny piece of sand with super glue. Experiment first off your keyboard to find the right size of sand. I found that REALLY small is big enough. Sand (being made of stone) will wear longer than the rest of your keyboard. Sand is "everywhere" on the ground or when you sweep your floors, but if you want you can get some from various masonry suppliers or hardware stores... just offer to sweep a little bit of their floor. :-)