GENERALLY:　 

 Tropical Hibiscus are a melting pot of a number of species crossed with the original Hibiscus rosa-sinensis. As a consequence the gene pool is so mixed that even the seed from the same pod can produce plants with flowers that differ in many respects - from different colors, flower sizes, patterns, bush types, etc.. Even though the seedlings from a given seed pod can be quite variable, there is a trend to occasionally resemble the parents. Therefore, one of the best general guides is to remember that like begets like, so if you like doubles, select seed from a cross where at least one parent is a double – preferably both. If you prefer large flowers, select parents that are large or the converse [large often begets large but some progeny of small size will occur, while small parents less commonly produce large seedlings]. Many varieties have a tendency to pass on specific characteristics, e.g., white rims, eye zones, basic color spectrum, etc. Regarding the latter if one parent is in the blue or brown spectrum, it is quite probable that many of the offspring will be in the blue/gray/lavender/purple or brown spectrum. The best chance of getting what you are looking for is to see qualities in one or both of the parents that you desire. Surprises are to be expected which is part of the fun of growing tropical hibiscus from seed.