My last 2 loops libraries with Loopmasters have been construction kits. Mike Skinner of The Streets snapped up this concept with the last release from the band before he moved on, as featured on The Guardian website last year, which is constructed almost entirely with strings from Realstrings Volume 2.
In designing loops libraries, I (naturally) try to make them usable in as many musical situations as possible; one usage I envisage is for video and film editors. Many will be making full use of loops and sequencing tech so it is a natural progression to supply building blocks in loops packs. Indeed, many composers work in this way, creating musical elements than can interact and overlay.
Here is a track constructed entirely from one set of loops in Realstrings Volume 3, using the solo loops rather than the more common ensemble loops, and it shows how the pack can quickly be used to create a music bed with all the emotional content of string writing, and the flesh and blood of real instruments.