I'm gonna do some GFX stuff for hl1 that anyone could use in their maps. Stuff such as dustmotes that float around, haze and foggy sprites, and a set some props.
Of course, all of this goes into Turnstile, so its not if, but when it is done, this pack will be released. I know some people have asked for props and such, i'm thinking about answering your prayers with a huge pack of content.
gotta admit, props make mapping a little more fun.