Your window sills may have several different holiday plants still in bloom, but they differ a lot in whether they are worth keeping after their bloom is over. Poinsettias may look nice for several months, as the colorful parts are modified leaves, not flowers (the real flowers are the little yellow parts in the middle). Pruning and repotting will produce a nice foliage plant later, but getting them to rebloom is very difficult. I tried some years ago by putting them in an unused bedroom, where there wouldn't be any light to break the long night requirement to set flower buds. But the bedroom was so cool that they didn't grow enough to produce new flower buds. So unless you have an unused warm closet with a light setup and a timer, it's not worth the effort.
Christmas and Thanksgiving cacti are good rebloomers, and Kalanchoe is sometimes. One year, I kept florist's cyclamen going and got it to rebloom at least once. Azaleas and hydrangeas are better suited to greenhouse growing, and usually not winter hardy outdoors for most of us. The same is probably true for most mums.
Hydrangea Azalea
Primroses in bloom appear in January at Tops market. I bought two last weekend. If these are kept well-watered, they will produce new flower buds for months. Then in late May, after the danger of frost is almost over (remember, although they are winter-hardy plants, they have been indoors and so are not acclimated to cool or cold weather), I plant them in a shady site outdoors, and most of them will persist for years.
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