What beginner-friendly, low-risk DIY decor works for a stark white apartment?

[MatthewFM]

I just moved into a new apartment with stark white walls and very little character, and I'm on a tight budget to make it feel like home. I'm not particularly handy, but I'm willing to try some simple DIY home decor projects to add personality without breaking the bank or my lease agreement. I'm thinking about creating a large-scale abstract painting for the living room or maybe building some simple floating shelves. What are some beginner-friendly projects that have a high visual impact but a low risk of disaster? Also, where do you find affordable materials and inspiration beyond the usual big-box craft stores? I'm aiming for a modern, minimalist look with a few statement pieces.