I use the website https://imgflip.com to make my memes for #zapathon - you can browse or search (Lightning, cat, whatever) to find images and gifs that you can then put your own text on.

You can also use my memes to start if you want - https://nostr.build/creators/creator/?user=382 - I’ve already shared them, but you’ll likely reach someone who hasn’t seen them. 👍