There's a limit to how much contrast is ideal (black is going to be pretty stark) but brown or blue or olive is what you want.Only for suits.And I disagree that a suit is over the top for this occasion. If it's informal, skip the tie.It's appropriate all winter. Rock on.
Just to keep the conversation going about Luxire's logo and identity system, here are a few ideas I drew up a while ago. Not intended to be viewed as complete, just sketches, really, to prompt discussion.