It would be cool to have a "general" monster pack that has the stereotypical monster sounds (if these are easy to do) such as:-
1. heavy footsteps (like T Rex, Godzilla that have lots of bass kick in them
2. blowing wind
3. rustling trees
4. evil growling, e.g. lion, leopard types
5. snake hissing
If there are some basic effects, these could be mixed to together to make new sounds (e.g. the T Rex was a mix of a lion's roar, a gorilla, & other sounds)
I have sounds I recorded myself for these but they don't sound right, I'd be interested in hearing what you are able to come up with.
6. gory sound effects - e.g. like when the Alien breaks through the guy's stomach, when zombies are eating flesh (wouldn't use these myself but I know they'd be useful for people). If people are making monster films then they inevitably are going to have a scene where the monster's eating someone
If you are able to do some of these, brilliant. If not, that's fine - everyone here appreciates what you're doing & already done (especially considering you have a full time job as well).