Latex styles - what do you use and where to find them

newcommandcatalogueEntry[4]{%
  parbox[t]{0.23linewidth}{textbf{#1}}%
  hfill
  parbox[t]{0.23linewidth}{includegraphics{#2}}%
  hfill
  parbox[t]{0.23linewidth}{textbf{Characteristics}\ #3}%
  hfill
  parbox[t]{0.23linewidth}{textbf{Application}\ #4}
}

catalogueEntry{Spotlights}{spotlight.jpg}
  {Eclipse spotlights are...}
  {Narrow to medium...}