Mixed boxes of colourful planting
You have all seen these, little 6 packs of different conifers or a six pack of multi colours of pansies, or a six pack of little herbaceous plants.
You get one of each plant, you buy it, go home and then what?
By all means buy a 6 pack of the same variety of plant, that way you can get 2×3 or 3×2 little clumps of the same plant which will have infinitely more impact in your garden.
Otherwise, leave the little six packs all alone in the Garden Centre and buy something more useful instead!