The present invention generally relates to compositions, such as gels comprising steroids. In certain aspects, the steroids are modified such that they can form gels, e.g., when complexed to metal ions. In some cases, the steroids form fibers, such as nanofibers, within the gel. For instance, in one set of embodiments, a steroid may be relatively hydrophobic, and/or modified to include a phosphate moiety that is able to complex to metal ions to form the gel. In some cases, such gels may be administered to a subject, e.g., through injection. Other aspects of the invention are generally directed to methods of making or using such gels, kits comprising such gels, or the like.