What a great question! I like using DBT skills too though I'm not in a DBT group. Try the website DBT self help, it has very good info.
I find if I can get to a place where I can be in the moment, then I can access my grounding skills. The trick (for me anyway) is to recognize when I'm triggered and do SOMETHING different, and let up on my expectations for just a little while.
Some things I do are Journaling, talking to a friend or T, post on PC, or use distraction, kids and work are great for that! When I'm really feeling lousy I give blood- it's a great way to give back and you get to rest, get a thank you and eat treats!!

I like swimming laps beacuse its very repetitive and there is so much sensory input. Also, getting warm helps a lot. I love saunas.
Also, taking regular time for myself helps. Take it regularly, BEFORE you feel you need it. As others have said, being outside is very helpful.