Hi,
I am currently playing with a deck I made from cards off this site:
http://www.eludication.org/playingcards.html, they are similar to the mentioned jumbo ones.
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If you like them, this is the way to make them pokerth-ready on Linux (you need imagemagick for this):
Download the 150 x 215 zip off the above site, unzip it in a temporary directory and run these commands in the resulting directory with the pngs:
mogrify -geometry 189x260! *.png
mv diamonds-2-150.png 0.png
mv diamonds-3-150.png 1.png
mv diamonds-4-150.png 2.png
mv diamonds-5-150.png 3.png
mv diamonds-6-150.png 4.png
mv diamonds-7-150.png 5.png
mv diamonds-8-150.png 6.png
mv diamonds-9-150.png 7.png
mv diamonds-10-150.png 8.png
mv diamonds-j-150.png 9.png
mv diamonds-q-150.png 10.png
mv diamonds-k-150.png 11.png
mv diamonds-a-150.png 12.png
mv hearts-2-150.png 13.png
mv hearts-3-150.png 14.png
mv hearts-4-150.png 15.png
mv hearts-5-150.png 16.png
mv hearts-6-150.png 17.png
mv hearts-7-150.png 18.png
mv hearts-8-150.png 19.png
mv hearts-9-150.png 20.png
mv hearts-10-150.png 21.png
mv hearts-j-150.png 22.png
mv hearts-q-150.png 23.png
mv hearts-k-150.png 24.png
mv hearts-a-150.png 25.png
mv spades-2-150.png 26.png
mv spades-3-150.png 27.png
mv spades-4-150.png 28.png
mv spades-5-150.png 29.png
mv spades-6-150.png 30.png
mv spades-7-150.png 31.png
mv spades-8-150.png 32.png
mv spades-9-150.png 33.png
mv spades-10-150.png 34.png
mv spades-j-150.png 35.png
mv spades-q-150.png 36.png
mv spades-k-150.png 37.png
mv spades-a-150.png 38.png
mv clubs-2-150.png 39.png
mv clubs-3-150.png 40.png
mv clubs-4-150.png 41.png
mv clubs-5-150.png 42.png
mv clubs-6-150.png 43.png
mv clubs-7-150.png 44.png
mv clubs-8-150.png 45.png
mv clubs-9-150.png 46.png
mv clubs-10-150.png 47.png
mv clubs-j-150.png 48.png
mv clubs-q-150.png 49.png
mv clubs-k-150.png 50.png
mv clubs-a-150.png 51.png
Then copy these pngs to your data/gfx/cards/default directory (you may want to back up your old files first).
heyn
P.S. Trying to comply with the cc license: these cards were made by Jesse Fuchs and Tom Hart based on David Bellot's designs.