Personally I think I'd just hit the wood with either a tan or grey colour depending on how old it's supposed to be. Then a dark brownish wash.

Does it have the grass texture molded in? I'd be tempted to paint it tan/brown and then cover it with static grass.

AMEN  !!!! -T.B.

Gamera

Personally I think I'd just hit the wood with either a tan or grey colour depending on how old it's supposed to be. Then a dark brownish wash.

Does it have the grass texture molded in? I'd be tempted to paint it tan/brown and then cover it with static grass.

Seconding Gamera's suggestion. My personal observation is that weathered wood surfaces---from man-made structures, to actual trees---are far more often shades of grey than what we think of as 'wood colors.' I tend to go with a mix of grey tones for the base color, the brown wash Gamera advised...then dry-brushing highlights with lighter tans and greys.

Ditto for the static-grass...an excellent choice that paint alone can't replicate.

Good luck with your projects! (And be prepared to show us pictures....)

Echo all the comments. Would add, if you use static grass, buy a mix or a few different colors. Use White glue  thinned with water and drop or so of dishwashing detergent,,spread that out and put down the static grass. One dry,, lightly dry brush it for a random effect. Good luck! Post some pics

Thanks for the responses.  I cleaned one of the bases last night and will experiment with some different looks.  I'll try and get pics posted.