A couple of years ago I decided to use up some of my stash and made a whole bunch of cards for my m-i-l as a gift. It was so liberating, no definite plans just grab a stamp or a pre-made topper and go for it. She was delighted and I was happy
I then did the same for my eldest sister but she is having trouble using them - wants to keep them to herself, so sweet. I blogged about them here: 45 Cards for a Sister | Crafty Jo's blog of craft techniques
and here:M-I-L Christmas Collection | Crafty Jo's blog of craft techniques
We also did a challenge at our stamp club to make a card depicting every letter of the alphabet - that was fun and varied but took a lot more thought.
Good luck with this task you've set yourself.