I try to eat healthy as often as I can for a few reasons. First of all, I like it: it makes me feel good, both mentally and physically. Equally important is the fact that it allows me to eat things that are unhealthy, with reduced food-guilt.
Lettuce cups are great for those reasons: delicious, and allows you to store good points toward mental food math. :)
The most important thing for lettuce cups is to use the right kind of lettuce. Iceburg won't work because it'll break. I use "living lettuce" from Kroger, but that or butter lettuce would suffice.
For my lettuce cups I used the grilled pork from earlier in the week and added corn, fresh onions, and a bit of bbq sauce to pull it all together. Simple, tasty, and delicious.