There are many entry points into a love of mathematics. If by elementary school you mean grades k-5 there are not a lot of tools that such students have so pattern hunting is part of the fun. However, in a general way, I think geometry and combinatorial geometry have been short changed as an entry, especially for very young kids. As students get further along in their education I think the possibilities pick up.
In my own opinion I know of no better way to get started attracting kids to mathematics than the books of Martin Gardner:
However, many children of parents who love mathematics may not share this passion with there their parents.
I also regret that knowing the role of mathematics in new technologies and the applications of mathematics in general get short shrift with people of all ages. I am biased because I am one of the co-author of this book, but I think the book For All Practical Purposes (FAPP) gives some of the sense of excitement involved in using mathematics in a variety of settings. FAPP has been through many editions and some of the early editions are probably available cheaply on the web. I was involved with the first 4 chapters which deal with urban operations research problems (Eulerian circuits- applications to street sweeping, etc.; Hamiltonian circuits - applications to package pick up and delivery, etc.) This book is designed for liberal arts students in college but parents may find it of interest, too.