If I'm reading you right TR then click format, slide layout and choose from any of the 23 other layouts available.
Whatever you have already done will auto convert into the layout/style of your choice.
If you do mean layout, you can move the various placeholders around on the Slide Master.
If you're referring to Background - 23 or whatever choices - you can use them as W says, or you can compose your own, save it as a picture and add it to the Slide Master: Format - Background - open the background fill dropdown - Fill Effects - select Picture tab - browse for the picture/design you composed. Makes it a lot less obviously Microsoft!
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