6 weeks until Cobi's first birthday!!!

We went to the venue yesterday so I could visualize decorating - it's a great space with lots of windows and the walls are painted a deep blue and a forest green. It's at a nature center, so we're doing a modern woodland animals theme (bright colors instead of rustic: chevron, yellow, green and blue with owls, hedgehogs, foxes etc).

The tables are rectangular seating 6 people each and I cannot decide how to decorate them. Buying fabric tablecloths would be really expensive and after paying for venue and photographer I only have about $200 left for food and decor. I don't care for the look of plastic tablecloths.

Should I leave them plain??
Here is the space we rented and the tables they use.

Next is the centerpiece I would LIKE the use but having trouble finding - it's colorful but fits the woodland theme.

Should I just leave the tables plain except for the centerpiece and focus more on the decor around the room? And any ideas for centerpieces? I was thinking a branch/tree centerpiece and hang animal tags from the branches (each table a different animal) but I can't find short stocky branches like the ones in the photo below so I'm afraid if I try something different it won't turn out. Please help!
Thanks!