It probably would assist knowing your modelling package.
For an odd and fast way of doing some "instant" models download some fonts and extrude them splines into models.
Shape them as you will and your done in.. well it still takes a while but it is a pretty speedy and useful method of making mouldings , architraves and Panelling .
A good font I recommend is Victorian Ornaments... be sure your not just extruding it and calling it a day whole legality of this would be a grey area at best.