A collection is a range built to go together. The manufacturer fires the floor tile, the wall tile, the mosaic sheet and the trim pieces from the same body and glaze, so the colors match across formats and the pieces share an edge profile. Buying within one collection is the simplest way to get a room that reads as one design rather than four decisions made separately.
Most ranges here span several sizes of the same face — a 12x24 and a 24x48 in the same color, often with a matching 12x12 mosaic sheet and a step tread or a décor strip. That matters where a floor meets a wall, where a shower pan meets its surround, or where a stair edge has to match the tread behind it. Sourcing those pieces from different ranges usually means a visible mismatch in tone or thickness.
Nothing requires you to stay inside one range. Pairing a neutral large-format floor from one collection with a patterned wall from another is common, and the neutral ranges here are made to sit under a wide set of colors. If you are mixing, order $1 samples of both and look at them together in the room — two whites from different collections rarely read as the same white.
If you already know the look, it is usually faster to start from color, effect or shape and pattern and follow the products back to their collection. If you know the room, start from application. The collections below are listed alphabetically, and each page shows every format and finish that range is available in.