Howdy!
"Then what?" IF you put it out on the concrete? Fry hamburgers on it! I know you can make hamburgers, good ones, too. ;-) Wouldn't have to worry about leaving grease spots, either. What can you do w/ an ugly, messed up, icky cutting mat?
Well, if the neighbor kid hits a ball thru' your window, you could use the mat to cover that window until the glass man comes.
You could put the mat over the hole in the fence to keep the rabbits out of the tomato patch.
Take that mat outside to the 'mater patch before it gets to 114*F and put some leg on the bottom of it, use it for a canopy to protect the produce. Optional use: lemonade stand.
Put wheels on it and roll it down the hill at the Pinewood Derby; you won't win but you'll entertain the Cub Scouts.
Use it to patch the roof of the dog house.
Prop one end on some bricks, let the ants & tarantulas have a slide.
Punch holes all around the edges; fold in half and make a tote bag by lacing up those holes; hang over the handles of a walker or wheelchair. Durable & waterproof.
Gather up a bunch of icky cutting mats and nail them on the wall; add some darts & some Hot Flash Mamas & margaritas: instant fun! Pic of idiot current prez optional. (note: on topic re: subject line)
See? There's lots of uses for those old mats. Don't give up now!
And, please, don't go out in the extreme heat, mat or no mat. Your investment was good for a limited time. Replace the mat. (I just told about getting one 1/2 price this afternoon, TSWLTH.)
Good luck!
R/Sandy -- blaming it on the pomegranate juice ;-P