As the title says, new member, so of course I've got some ideas I'd like critiqued by those with more experience at SCP writing.
The first idea I've gotten as far as a first draft (posted here). It's actually based on the worst dream I've ever had - the "variant" behavior is actually what I care most about, and the other stuff is largely just to give it a more general behavior pattern.
My second idea I'm less certain about. It's a humanoid SCP (strike one), has moderate reality-warping effects (strike two), and is similar to a cross between scp-781 and scp-239 (strike three). The actual concept is that it's a young boy that is to all appearances normal physically and mentally (though possibly non-aging or slow-aging, to retain the hard-to-control nature of a child), but occasionally objects or creatures that he's imagining or thinking about will manifest nearby. Containment would entail keeping him occupied as much of the time as possible, to keep his mind from wandering and hopefully keep him from imagining anything dangerous. Which TV shows / movies / books / music are used to keep him busy would have to be carefully screened - Transformers, while age appropriate, could lead to Megatron appearing inside and SCP facility, which would be a [i]bad[/i] thing.
Because he'd be physically normal, and have no active control over his ability, terminating/decommissioning him would be pretty trivial, and he'd only be kept around to test whether it's possible to guide his manifestations to something useful. Meanwhile, some occasional manifestations could already have been put to use in various ways - for example, introducing one of his Barneys to 682 would be a great morale-booster…
I'm sure the first idea could use some tweaking, and I'm not sure the second is even particularly doable, but I'm eager to contribute!