There are several different variations when it comes to BDU's.
Depending on your area and the time of year of course, some will be effective and some won't be as useful. As for a 'universal' camo, ACUPAT and Multicam are marketed as such but there is no way for a camo to be 100% universal.
Observe the vegetation around your area check out camo patterns online or hit up a local surplus and check some of the BDU's they have in stock and go from there.
Alternatively, if you think you won't be playing airsoft in your area. Anything green should do the trick (if you'll be playing in forested areas). CADPAT, MARPAT even the good old three color woodland the US used.
When it comes to OD, ask yourself this, why do you think it isn't issued anymore?