APFS Christmas Cards - any ideas?

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Gifted ladies, help please.
Tomorrow is the last day for taking in my 4 year old's APFS Christmas cards.
I am looking at my red, blue, green and yellow finger print paints and haven't a clue as to what might look nice on the card. (Am planning to do some kind of hand paint print with a vaguely Christmasy theme - possibly a star theme. The bad news is that I am not naturally artistic in any way sadly. I should have thought of this before now! And I always really like the ones I get. Has anyone any simple tips to pass on for a nice (ie idiot mother proof) card that might use all 4 colours, look fairly Christmasy and not look too bodgey?
Many thanks. Any suggestions gratefully received.....

A drawn Christmas tree with fingerprint baubles?

Fingerprint robins/birds similar to this?

Children with red fingerprint rosy cheeks?

It's a bit late or I'd have suggested you get hold of this book

Thank you! That's really helpful.
We did do some finger painting on A4 in the end but nothing that could remotely be sent to even their most devoted admirers!(My 2 year old got very enthusiastic too). So I don't think I will be taking anything in tomorrow. (I did try a tree but it didn't look that special).
I will look out for your suggested book at the library and plan better for next year!
Many thanks for taking the trouble to help though! And the robins are sweet.

Cheers.
SB