My beds have pretty much been set up as iris only. I do get the beds ready ahead of time. When I created this year's new bed, I knew I had to make it large enough to accommodate more than I just ordered, because so far I have had to add more garden with every year I order.
I do plant with size in mind with the shortest in front and tallest in the back (though some TB really don't meet their registered height - ehem). But I also plan the garden bed by complimentary color mixes. Such as: the silver grey of Silverado was striking with Coal Seams' dark purple, and the red and yellow of Michigan Pride looks great with the all red of Grateful Red.
I do not have tags (yet), but map every garden. When I move iris I remap the garden.
