The setting: a small, windowless conference room with a fluorescent lights and a table too big for regular cloths.
The challenge: make it festive without referring to Christmas in particular. I'll be serving people of every faith in an environment that's not my home.
What do you think about using the pastries as a Mexican inspiration? (Several of you beat me to the punch in the previous comments!)

No burros, sombreros or pinatas allowed!
By buying the pastries, I leave myself almost no budget for decorating. I don't even think I can spring for poinsettia plants.
Perhaps that's not a bad thing--large, sculptural paper poinsettias might seem less traditionally Christmas. I'd rather have a subtle nod to the season and to Mexico.

Colors? I'm thinking lime green, yellow and a rosy red. The room is painted light blue with slate blue chairs.
I'll have to find a bright woven fabric remnant to throw across the table. I could line baskets with bright tissue paper, or make some kind of tin-punched containers for tea bags and coffee stirrers.

All suggestions and special touches appreciated! Especially the music--right now all I can think of is Feliz Navidad. Any recommendations for a classical guitar CD or something instrumental, yet upbeat?