Cafe Press: This website allows you to create digital designs that can then be sold on the platform. You'll earn a commission for everything that sells and you'll never have to deal with logistics like printing, warehousing and customer service. If you have some graphic design skills, then this is a great potential source for your web-based income. 

If you worry that your readers won’t like the fact that you’re making money, I encourage you to shift your paradigm on this a bit. If someone provided valuable information to you, wouldn’t it be nice to reward them a bit? Maybe they taught you something. Maybe they saved you time for not having to search for the information themselves. Maybe they showed you some great uses for a product you were considering buying anyway. Whatever the case, if you’re providing affiliate links in an ethical way, no one should fault you for it.
The topic you choose must have enough depth that you can create a lot of content for it. This is important for building an authoritative site, for search engine optimization, and most importantly, for the end user. If you don't have enough content about a topic, you're not going to be taken very seriously as an authority on the topic and it's unlikely you can convince someone to make a purchase from you.