A bit of history will help you begin your planning, and here are some altar photos for inspiration.
Now that I have (hopefully) talked you into putting up your very own St. Joseph Altar, I invite you join the 1st Annual St. Joseph Altar Blog Fest. To be included, make a blog post about your Altar, including details and pics, then link it here. I will begin the linking on the March 19 Feast of St. Joseph and continue till the end of March. Simple or extravagant, we want to see it! So come back on March 19 to link your Altar post. In the meantime, head to the Virtual St. Joseph Altar for all the info you need to get started planning your Altar.
Feel free to grab this button for your blog. Spread the word and let's get lots of others involved -- just link it back to this post.