My fireworks photos could use some foreground

Unfortunately, my city doesn't start until 9PM, when it's really good and dark, so no long-exposure foreground for me. Actually though, where our family watches, the foreground would just be an apartment building anyway.

So I'm open to comments, but I already know they look like they're from a fireworks catalog. (Which I guess is not necessarily a bad thing.)

Here's the full set, and here's a sampling: