This PBS wiki page illustrates Sinningia hybrids, some named and some not.
Sinningia glazioviana × iarae is a hybrid with Sinningia glazioviana as a seed parent. Somewhere there is a recessive gene for bronze foliage as that is what the leaves are in full sun. It is quite striking when in bloom. I have had 2 flushes of flowers this year on small plants. My plants are in 1 gallon containers and stand about 10" tall. Photo by John Ingram.
This is a nice primary hybrid of Sinningia leucotricha × macropoda. It also is a stable F2, coming true from seed. Photos by John Ingram.
Sinningia 'Tante' should be used more often. It has a possible hardiness of zone 7 and grows just as well as Sinningia tubiflora in the open garden, even if it is less aggressive. It is supposed to be a hybrid of Sinningia tubiflora × Sinningia sellovii both of which are from Argentina and are hardy. It has a nice subtle color that works with almost every garden scheme. Photos taken by Lee Poulsen and John Ingram.
Here are a few photos of some hybrids from Ruth Coulson in Australia:
Sinningia 'Apricot Down' is a lovely plant hybridized by Colin Rampton with Sinningia leucotricha in it's background as is obvious from the leaves and flower color. The cross is leucotricha × iarae.
Sinningia 'Flying Colours' , Sinningia 'Old Flame', and Sinningia 'Spicy' are (in Ruth's own words "from crosses of Sinningia iarae and a very pretty eumorpha-type plant with exceptionally pretty lavender and apricot flowers. Unfortunately I no longer have that but its genes live on. The plants grow really big, even more so this year than last. They have enormous tubers - needing 10" pots - and have eight or nine stems per tuber. With a height of 2 to 3 feet, this makes a pretty bulky plant - but how showy! Flowering season is probably 4-5 months." I have asked Ruth to add some more height to her breeding program. So hopefully in the near future, we can have 3' tall plants that will bloom over a long period.
Sinningia tubiflora × incarnata was not my cross but came from one of the U.S. seed funds in the early 1980s. It might have been hybridised by Ted Bona, and it might have come direct from him. The seedling was given to me by another grower. It grows about 12" tall but the flower spike is 2-3 ft above that, but more compact if grown in full sun which is its preferred location. Flowers are long tubular pink, not scented. It produces many laterals which, however, don't flower. Reproduction is easy from offset tubers.
And another smaller hybrid she calls Sinningia 'Witchcraft'. It is a cross of 'April Star' × (tubiflora × incarnata) :
This is another one of her great hybrids. 'Kaylah' (named after her grand-daughter) is a beautiful plant. It is about 300 mm (12") tall.
'Little Redhead' is a S. cardinalis hybrid. It flowers almost year round with multiple stems that are 200 mm tall:
'Michelle' is very similar to 'Kaylah' as far as size and floriferousness:
More information can be found on the Sinningia species wiki page