This is one reason why I always have multiple WIPs. I never get bored with a technique or repetitive block when I can easily flit from one project to another like a butterfly will flit from flower to flower in the garden. Samplers are also a great way to have fun and learn many techniques. I am a big fan of samplers but will always be a multi WIP person no matter what, even when doing a sampler, I will have others going.