I found these pages while looking for some alternative ideas for my kids' 3in1 Lego sets. This place is great, in fact, lately when I am choosing new sets for my children, I consult this site for their "MOCability".
However, I quickly found that some great looking alternatives are too fragile for my children's play, this inspired me to try to fix them and before I knew it, I enjoyed coming up with ideas of my own. If I had time for another hobby, I could easily see myself getting serious with MOCing, it is quite challenging and a good outlet for creativity. Perhaps in my next life.
As it is, I enjoy sharing the alternatives I did for my kids. They may not be the most awesome here, but we have different priorities at home: sturdiness and playability :-).