I know what you mean about all the geranium boxes in Europe. I saw a lot of them in Germany. It's so boring here.
Try looking up cascading, trailing and Zonal-hybrids and see if that is what you are looking for. I feel these are done by cuttings. I did not get any hits so far for seeds with any zonale flowers on an ivy plant but someone else here might know about them.
Search the following terms: geranium Great Balls of Fire series, the Cascade Series by sygenta "Royal Lavander", Geranium interspecific, Calliope.
These are crosses between the two types of geraniums, zonal and ivy, so I don't know if you will find seeds. If you do, they will probably be expensive.