Maddie, you're a woman after my own heart. I have been passionate about plants for the past 25 years and I do the same thing: I never turn down a plant. Even those plants that friends give me, to nurse back to health, I usually don't give it back. Most of the time they don't ask for it back, and if they do, I have a way of convincing them that, if you take the plant back to your place it's probably going to end up in the same predicament it was in before (which is usually true). For the past couple years though, I've not purchased too many but what I've done is rooted and combined plants that I already have, and made new ones.
This is another container garden I created, just yesterday (12/17/12). This is a combination of 3 plants in one large pot. Today I moved the plant a couple inches, and it fell off the stand, dirt spilling everywhere. I cleaned it up, cleaned up the mess, and this is what it looks like now (bottom-right plant). In a couple weeks or so, it will be full. Top right is a birdhouse I bought at Walmart for $5, I put some dirt on the inside and placed a pothos inside. I cut it from the bottom so it will grow thicker.
I do sometimes feel a little out of place here, because most of the time you guys are posting about veggie and outdoor gardens... I doubt if I'll ever do veggie gardening but I am working on a monster flower garden for Spring/Summer 2013 ..