In their most used version v4, UUIDs are random, and that's a useful property. But sometimes all you want is a UUID that is easy to remember. To hell with randomness!
A minor complication is that for a string to parse as a valid UUID, the variant and version bits should be set correctly (to 2 and 4, respectively). Here are a few suggestions that pass the test:
facade00-0000-4000-a000-000000000000 decade00-0000-4000-a000-000000000000 ad0be000-0000-4000-a000-000000000000 c0c0a000-0000-4000-a000-000000000000 5ca1ab1e-0000-4000-a000-000000000000 f100ded0-0000-4000-a000-000000000000