Yes, you can. Presence XT comes with a very comprehensive list of sounds, and Mai Tai is especially good for pads and synths. If you have Studio One Pro (or the VST support add-on for Artist), you can use any of your own virtual instruments.
By "ambiences", I'm assuming you mean a type of pad. If you mean literally ambient sounds for games as in wind, birds, thunder, rain, ect., Presence XT has several random sound effects like that, but they might not be what you want.