My husband loves pointy leaved plants and has a few he wants to be brought into the house. Currently, they are in our greenhouse, but I'm reluctant to bring them in.  Is there area, where a large spikey leaved plant would work well? There are no thrones, but the leaves are thin and pointy. "spikey" 

In my opinion, pointy leave plants has more to do with symbolism than Feng Shui. 

For example, some personally felt that pointed "items" and even plants are considered inauspicious to them. Just because pointed neighbourhood roof-lines are inauspicious this group simply link two and two together .... 

As mentioned,, Feng Shui does not micro-manage even pointy leave plants.

Totally not related to Feng Shui is the concern of young child or toddler accidentally running and poke their eyes into harder pointed leaves such as the Snake eyes plant etc... Or that frisky dog's eyes accidentally... also.

Frankly, if you are not too concerned one-bit, go ahead.