I also needed to raise my speakers (Thiel CS2.2's) in my previous listening room. For quite a while, I attempted to solve the problem by tilting the speakers as Twl suggests. However, whether actual or psychological, I became increasingly bothered by the sensation that I was now "looking down" into the soundstage, as if I was sitting in the balcony - a perspective that does not correctly apply to most of the music I listen to. Going ahead and raising the whole speaker off the floor flat (several inches in my case) proved much more satisfactory in the long run. (This was a slightly too small room in reality for these speakers, so the bass held up OK, but if I had been able to sit the ideal distance from the speakers, I wouldn't have needed to raise them this much; I actually wound up using small stepstools to accomplish the task.)
In my new room (where I can listen from the correct distance), if I decide to raise them just a little, I may turn to the Sound Anchors dedicated stands. These can be custom ordered for most floorstanders with dimensions provided, but Sound Anchors makes several standard models for popular speakers (including discontinued models such as my Thiels, but I'm not sure about the Hales). These stands mass-load the speaker's base, and provide a wider footprint for increased stability and rigidity, while raising the speakers a couple of inches at the same time. The research I did on these suggested that many users feel this product improves the sound; Thiel themselves liked the results, and offered the stands as a factory option, as do some other makers.