I've used Black Diamond Racing Cones and liked it. Also examine the stuff at Herbie's Audio Lab. All these are not very expensive and sell used for 60% of list in a heartbeat so your overall out of pocket will be very low.
With monitors on bookshelves you lose imaging but the tonality can sound fantastic if you correct for bass issues.
I'm assuming that your speakers are FRONT-PORTED.
If they are rear ported you will need to do a lot of experimentation with angles and distance from wall, and, may just end up with a compromise.
Usher s520 are front ported and beautiful in black and sound very lovely, AND seem to hold their used value, in case you need to make a purchase to get you through this year.
Art
With monitors on bookshelves you lose imaging but the tonality can sound fantastic if you correct for bass issues.
I'm assuming that your speakers are FRONT-PORTED.
If they are rear ported you will need to do a lot of experimentation with angles and distance from wall, and, may just end up with a compromise.
Usher s520 are front ported and beautiful in black and sound very lovely, AND seem to hold their used value, in case you need to make a purchase to get you through this year.
Art