i guess there is no way to copy all parameters of a layout into another one. would be a nice feature.
but as solo layers click into the layout when all layers selectable -> ctrl+A ctrl+C
new layout -> ctrl+V
same for sheet.
+ Every X Second
-> Go To Layout ("layout"&random(3)) if you have layouts named layout2,3 etc.
dont know if it works, but have fun trying <img src="smileys/smiley1.gif" border="0" align="middle" />