had two metal framed foot stools with cloth tops that wore out. these are part of our pool deck furniture.
i removed the cloth tops and replaced them with wood. i drilled thru the wood slats and the metal frame. i then attached the wood to the frame using small bolts and nuts. then i used one of those hand held blow torches and burned the wood until the grain showed up real good, this is called "Burn staining" My son showed me how to do this and i forgot to give him proper credit when i posted my last project when i rebuilt my wifes glider.
then i sealed the wood with a premium waterproofer and applied 2 coats of mini wax polyurethane. there is no actual stain used in this type of project, i suppose you could but i did not. i also ran a 2x4 under the middle of both as some of our guests sit on the foot stools, i suppose thats why the fabric wore out. the date and time stamp on the photos are wrong. i refinished these this weekend.
the only problem when using pressure treated wood is that you must wear a respirator when sanding due to the toxicity of the dust. actually you should wear a sanding mask when sanding anything, the only thing that goes into our lungs is AIR.