Hi Jen,
Are you stuck on a table lamp? I was going to suggest maybe going with a floor lamp? I think it might be easier to find something to go with this lamp and the look of your living room.

Love the lamp by the way!

can you show us what your furniture looks like to get a feel of what to recommend?

So here are two photos to give an idea of my living room (sorry about the quality, I took them with my phone). It is still a work in progress and I have plans to buy a coffee table and rug, as well as reupholstering my chairs. But basically there is a lot of maple furniture with metal accents, and the two main colours are/will be grey and green. I hope this helps.

If you place the second lamp on a non-matching table that will work. I think the second lamp could be any mid-century style in about the same height. It shouldn't be too similar but can lend cohesiveness to the room if it also has a drum shade (no need to match the shade color). A floor lamp as suggested would also work. A drum shade on that perhaps.