This is probably the 5th version I've seen.

I improved it once, DaBrain did a really nice job on a improved version, and a couple of other people have offered an enhanced version as well. Personally, I just use the one on
this for myself (the splash screen from my personal VPs), having long since grown tired of the same old thing.
But you could have actually done yours in DDS format rather than PCX. Uncompressed 32-bit, for the alpha channel, works for pretty much everyone on the interface. Just be sure to not use mipmaps (the game ignores them, but will complain in debug builds, as well as just wasting memory).