To verbally skip count, we do a little rhyme called "Ringo Rango". (Here's a link to check it out: Ringo Rango.)
A fun way to emphasize skip counting by 5s is doing painted handprints! In the past, I've used a long strip of bulletin board paper and divided it into squares. I paint the students' hands and they put it down on the paper. Then, we go back and label the numbers under each handprint. I hung this up along the top of my wall and the kids referred back to it all year.
For skip counting by 10s I tell the kids that crabs have 10 legs. You can open by reading a book about crabs to grab the kids' attention. I've uploaded a freebie presentation for you to go with crabs and 10s.
I use this cut and paste activity as a quick assessment at the end of the skip counting lessons.
What do you do to teach skip counting??