Do all the diffgerent coloured Lanterns use their rings to build constructs? I just went thriough the first half of Blackest Night and the Green Lantern books that tie in, and from what mI can see, only the Green Lanterrns, Sinestro Corps and Larfleeze (spelling?) seem to make constructs. I mean there appears to be lots of light beams being thrown around but not many constructs. Is it just Green, Yellow and Orange that make constructs?

Indigo is able to take the power of other corps, and they use those to make constructs. Red Lanterns are capable of it, as seen when both and wore Red rings. However, the Red lanterns mostly do their burning, blood barf thing. Don't remember if the Sapphires make constructs or not.