You could make some guild/race combos, which would relate to known facts about
these races. Like if you were Elf/Ranger, you'd get bonuses from guild that
make the combo usable. If you would join rangers with elf, you would lose int
and wis and get str/con/dex instead.

In general it would be much more cool if you would get your stats and stuff
mainly from guild, not from race. Race would just give the max you can get in
each stat. These combos would raise the stat max if system were made this
way.