They're called pen advertising blotters.
Yes,that's how you would use them.
As has been said,they're inexpensive & great to collect & display.
Usually came in small sizes & made of thick paper,their backside is what you blot with,like a sponge.
Some of them are really unique.
I always keep an eye out for em @ oil& gas,or & any swapmeet.
Toy shows seem to have a good representation of them too.
Here's one I picked up,measuring roughly 9" X 4" that has great color & graphics.
I protect it with a plastic overlay.