I've made myself a nice 32x pack for use on my server, and I set the url to it in server.properties in the hopes that people who connect to the server would have the opportunity to download the pack for themselves when they join.
Unfortunately, it seems like everyone who has downloaded it that way so far has been having absolutely crazy visual issues with it. Here's some examples:
Naturally, I didn't build my bridges out of cobweb, tripwire hooks and lillypads.
However, when people download the pack from the same link as in the server.properties file and install it manually by dropping the .zip into their texture pack folder, the pack works without issue.