I just came up for a new idea for a HL1 mod, but due to my poor mapping and coding skills as of now, I can't act upon it, so I'm offering it to you guys if you want it.
The mod is called "My Bretheren." You are X, an innocent houndeye caught in the middle of the Resonance Cascade fiasco. On Xen, you and your pack discover a human campsite and suspect something is amiss. Suddenly, you are caught in a portal storm and are transported to BMRF. At this point, you are alone, wandering the complex aimlessly trying to figure out where you are. Luckily, your houndeye bretheren were teleported to the facility as well, and with their help, you try to find a way home. As you wander around, you find out your mother, Yah, has been captured by the researchers. Freeing her, you and she go alone and continue the journey. Unfortunatly, Yah is shot down by a group of marines and left for dead. Too heartbroken to go on further, you stay with her body and die with the complex.
I had different ideas on how this mod would function, namely:
a) Third person view. I think it would be rather difficult to have the game in FP, because there aren't many interesting things you can do at that level.
b) Three attacks: A melee bite, the sonic burst and a burst jump that allows you to jump higher.
c) Like in OP4, you'd be able to lead a squad of your buddies into battle.
d) Multiple spieces of houndeye, like a Jungle Houndeye, Cave Houndeye, etc. Adds more variety.
This isn't a demand for someone to make my mod for me. I'm just throwing out ideas to anyone who has writer's block. Enjoy.