Spycimierz is particularly known for this tradition, but it is hardly alone in the world. You can find stunning floral carpets elsewhere in Poland, in Italy, in Spain, in South America. Parishes here in the US have even taken up this tradition!
The artwork will be destroyed as many feet tread over them during the procession, but it’s unlikely anyone thinks of it as a waste. These works (and the labor they require) are humble gifts for Our Lord, Who has given us a gift beyond anything we can hope to repay in the Blessed Sacrament. The beautiful carpets are a small reminder of Who is passing by that day—the same Person Who humbly dwells daily in our churches, our monstrances, in our own unworthy selves in Holy Communion.