Foreplay tips please

I'm not very experienced when it come to sex. My husband and I's sex is very basic although we r started to step it up a bit now that we're learning new things about each other.

However the fore play is a little *boring*. It's mostly kissing and grinding/rubbing on each other, and occasionally he (TMI) sucks on my nipples. It gets us both turned on but it's just okay. I want to know what else I could try to surprise him or what works for you guys.