HATE. People are starting to ask about wedding gifts, and I don't know what to tell anyone. We didn't register, because we're having such a small wedding. My sister is bugging me about it. I hate asking for things. Everything we really want is $$$$. Like a shed, or fencing in the yard. And I don't want to say money.
Maybe this was tacky, but we were in the exact same situation as you. I didn't register, or have a bridal shower. We just wanted to make some home improvements. When/if people asked, I told them that I hadn't even thought about it, we were just happy to have people come celebrate with us. Then, if the conversation swung that way, I told them that we weren't taking a honeymoon because we were looking forward to doing some home improvement projects.
When a couple doesn't' register I thought it was just assumed that they wanted cash.
What if you said you are working on some home improvement projects and would like home depot or Lowe's gift cards? I don't know what the etiquette is here, but it's not the same as asking for cash.
I'm sure your sister wants to give you something personal and concrete as a wedding gift.
If you are doing work around the house and yard, I would suggest a gift card to a nursery where you can go and pick out some plants, a tree, or flowers together.
My other favourite gift is sheet sets because you can always use more and they are a traditional wedding gift. Or linens for a spare bedroom. I generally make my close friends (and certainly my sister) a homemade quilt. Along with cash.