使用嵌入式图形创建R表

I'd like to be able to create a table with one of the columns being graphical, others text. Ideally, I'd create an excel spreadsheet, but I'm pretty sure that none of the R to Excel packages can write PDFs into cells. I think I can hack something together using Knittr or Sweave, though I don't know how, exactly. Any advice?I'd like to be able to create a table with one