Osborne Clarke Consumer 2018 [pg. 9] applies on most of its pages a two-column layout, and sometimes puts a plot in each column.
Another design choice has two columns of text but sometimes spreads a wide plot across both columns. Here’s an example from Norton Rose AustAgribus 2018 [pg. 14].
King Wood AustraliaDirs 2015 [pg. 25] spreads an unusual polar chart across the right two columns of a three-column layout. The gray bars on either side are the edge of the page, by the way, not a design element.
Going one column further, Burness Paull CorpScotland 2016 [pg. 15] stretches an unusual pie chart across all three columns.
DLA Piper Debt 2015 [pg. 8] extends a plot into the right margin.