If I don't have a photo or something better to send then I send a index card. I always send a big enough envelope so if the celeb has a photo of their own they'd rather sign instead of my index card they can do so. I've gotten a few index cards back so I think they're good for autographs.

If you don't have a lot of space, index cards are great for autographs. Or you can mat them with a photo of your choice.

I've never heard of a person refusing to sign an index card. A blank paper may be problematic. Gerald Ford used to refuse to sign them after a while, because people who turn his autograph into the signature line of a faux check, "showing" he got paid off for pardoning Nixon. People may also be wary of signing blank pieces of paper for similar reasons - people faking letters from that celebrity, using them as COAs for items that they never saw or owned....

Are index cards good for autographs ? Are there some celebrities that refuse
to autograph blank paper like an index card !!!