You can use Find & Select in the Edit menu to select by layer and pen color etc.
With these elements now selected, use Edit Selection set and in one step you can change the pen for this set of different types of elements.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"