When I have a few minutes, I get out a 4 x 6 blank greeting card and print "happy" in whatever funky way I feel like. Then I tangle it. I also have some printed cards (gelli prints and mono prints and stamped colors) and I sometimes select from those. Like this one.
Then when I need the card I can print below the tangled word "birthday", "anniversary," "new house", "graduation" or whatever and personalize it to the #. Happy 25th anniversary…or whatever.
But most of the card is already done! Voila.
Consider starting a Happy Card file.
Everyone likes to "get happy".